Re: [Killietalk] Need more males from F. gardneri N'sukka spawns

["Keith Cook" <kcook at sdgdocs_com>]

I have a breeding group of F. gardneri N'sukka in a 30 gallon with a big 
clump of java moss, another big clump of java fern and several other 
plants rooted in the gravel.  After removing the plecostomus and large 
snail I am again seeing babies.  However, I continue to get almost all 
females!  I now have about 10 females, two full grown males and about 8 
relatively new fry.  None of the new fry have yet seemed to show male form.

I understand variations in the number of the sexes is quite common.  Are 
there any reliable ways of improving the relation of males to females?

Bob

There has been volumes written about sex ratios on this forum in the past.
If you have some free time (like a month), you might go to the archived
killitalks and search "sex ratios" or something like that.  But here's a
couple quick thoughts I have.  First, maybe the fry aren't really old
enough.  Being winter the water in their tank is probably colder, assuming
you aren't using a heater, and it will subsequently take longer for them to
sex out.  Second, if you really are having a problem, try raising isolated
pairs.  I've seen many people say they've improved their chances of pairs if
two fry are raised by themselves. In my totally unscientific test of this
theory, I have found it to work 100%  of the time with the grand total of
one pair I've tried it on.  
   
Keith
AKA #9058


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